<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
    <!--准备好一个"容器"-->

    <div id="test"></div>

    <!--引入库-->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <script type="text/javascript" src="../js/babel.min.js"></script>


    <script type="text/babel">

        class Login extends React.Component {

            state = {
                username: '',
                password: ''
            }

            handleSubmit = (event) => {
                event.preventDefault();
                const { password, username } = this.state;
                alert('用户名:' + username + "   密码:" + password);
            }

            saveFormData = (dataType) => {
            
                return (event)=>{
                    this.setState({[dataType]:event.target.value});
                }
            }

            render() {
                return (
                    <form onSubmit={this.handleSubmit}>
                        用户名:<input onChange={this.saveFormData('username')} type='text' name='username' />
                        密码:<input onChange={this.saveFormData('password')} type='password' name='password' />
                        <button>登录</button>
                    </form>
                );
            }
        }



        //2.渲染虚拟DOM到页面
        ReactDOM.render(<Login />, document.getElementById('test'));
    </script>

</body>

</html>